1
Pierre Deman, Henri Butin: Frequency-hopping radio communications system. Thomson-CSF, Cushman Darby & Cushman, November 19, 1985: US04554668 (134 worldwide citation)

A radio communications system comprising at least one master station and a plurality of slave stations in two-way frequency-hopping communication therewith. For telephony, speech is digitally encoded. Digital data is transmitted in packets using successive bursts at different frequencies separated b ...


2
Pierre Deman, Jean Potage: Apparatus for processing speech in radioelectric transmitter/receiver equipment suitable for transmitting and receiving speech. Thomson-CSF, Cushman Darby & Cushman, November 5, 1985: US04551853 (12 worldwide citation)

Apparatus for processing speech in radioelectric transmitter/receiver equipment is adapted to transmitting and receiving speech. The apparatus comprises a compression circuit for compressing the dynamic range of the speech signal, said compression circuit being formed by at least one variable transm ...


3
Jean Claude Ben Sadou, Pierre Deman: Automatic gain control device for a single-sideband receiver. Thomson-CSF, Cushman Darby & Cushman, May 20, 1980: US04204172 (9 worldwide citation)

A circuit determines whether the signal transmitted by a variable-gain amplifier comprises information or not. If it comprises information, its level is regulated, by comparison with a first reference signal, in order to give a predetermined correct listening level at the output of the receiver. If ...


4
Pierre Deman, Jean Potage: Arrangement for discriminating speech signals from noise. Thomson-CSF, Cushman Darby & Cushman, June 19, 1979: US04158749 (7 worldwide citation)

An audio squelch circuit uses spectral analysis of the audio signal to derive two test signals, one of the two indicating speech presence "energy" and the other "voiced" speech presence. The two test signals are logic-AND combined to decide speech presence and open the squelch gate. Detection of spe ...


5
Pierre Deman, Luigi d Auria: Telephone set for optical fibers lines. Thomson-CSF, Cushman Darby & Cushman, February 5, 1980: US04187404 (6 worldwide citation)

A telephone set for optical fibers lines having a coupler for directing a first part of the light received from the input optical fiber on a photo-cell and a second part of this light on a microphone modulating this second part without electrical intermediate apparatus, the photo-cell feed alternate ...


6
Pierre Deman, Henri Butin: Frequency jump radiocommunications system with interburst redundancy. Thomson-CSF, Cushman Darby & Cushman, November 19, 1985: US04554669 (6 worldwide citation)

A radiocommunications system for transmitting packets of digitized data between a central station and a plurality of subscriber stations using a common set of frequencies. Each subscriber station and central station has an input circuit for compressing packets of digitized data, and a transmitter fo ...


7
Henri Butin, Pierre Deman: Telephone set and system utilizing frequency division multiplexing. Thomson-CSF, Cushman Darby & Cushman, June 21, 1977: US04031327 (6 worldwide citation)

The telephone set comprises a programmable carrier generator which supplies the same variable frequency to an amplitude modulator receiving the local voice signals, and to a synchronous demodulator which makes it possible to reconstitute, without band pass filtering, the voice signals of any set wit ...


8
Pierre DeMan, Alberto Pimentel, Jean Claude Ben Sadou, Charles de Riviere: Transmitter-receiver with automatic alternation control. Thomson-CSF, Cushman Darby & Cushman, April 20, 1982: US04326293 (4 worldwide citation)

Prior to each voice activity period, the transmitter supplies a digital preamble for coding the speech signal levels and during these periods high frequency signals modulated in substantially constant amplitude, but transmits nothing other than said preamble and said periods. On reception, a signal ...


9
Pierre Deman, Albert Pimentel, Jean Claude Ben Sadou, Charles de Riviere: Transceiver. Thomson-CSF, Cushman Darby & Cushman, December 8, 1981: US04305154 (4 worldwide citation)

The transceiver according to the invention is controlled by an automatic alternation device in order to permit transmission solely when voice signals are to be transmitted and when the receiver does not receive such signals. On transmission, the transmitter supplies constant amplitude-modulated, hig ...


10
Pierre Deman, Henri Butin: Fixed station of a radiocommunications system with frequency jumps and two-way transmitters. Thomson-CSF, Cushman Darby & Cushman, February 25, 1986: US04573209 (4 worldwide citation)

A frequency jump radiocommunications system fixed station in which n receivers and n channels may be connected to p transmitters; p being less than n. A management circuit is provided on each of the n channels to provide signals indicating the active/nonactive state of each channel. A time/frequency ...